Just insert the RC-508 into the PCI-E slot of your motherboard, and own USB 3.0 ports immediately. PCI Express (PCI-E) is a standard interface on most types of motherboards. With PCI-E, RC-508 provides high-speed data transferring between PC and USB 3.0 devices, up to 5 Gbps; thus, you may directly enjoy high-resolution videos stored in your USB 3.0 storage, other than copying them to your PC in advance. RC-508 offers 4 ports of USB 3.0, and each supports backwards compatibility to USB 2.0 and 1.1 automatically, making it easy to copy files and enjoy videos simultaneously.